File Path For External Js

I have the following directory structure

index.jsp
a.js
b.js
|
|--/templates
|
|--/blah.jsp

Now blah .jsp is included INSIDE index.jsp.
In blah.jsp I have a button that calls a function inside b.js.
In index.jsp I have following code inside head tags:

<script src="a.js"></script>
<script src="b.js"></script>

and I figured since blah.jsp is included inside index.jsp, I should be
able to access the javascript methods with ease. But its not happening
that way. I get an error (object expected in the line that has button in
it). BTW, its not a problem in my JS or JSP code, because if I put the
js file's contents inside blah.jsp, then it works like a charm!

So what am I doing wrong?

I also tried moving my script import statements inside blah.jsp as:

<script src="../../a.js"></script>
<script src="../../b.js"></script>

But this doesn't seem to work either?

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